In the late summer of 1931, Clark County farmers poured milk on the roads, most of it confiscated from boycotted distributors’ trucks. Vancouver-Portland milk distributors dropped milk prices low enough it threatened farmers’ businesses.
The spilt milk led to violence, first on the Interstate Bridge and then in Cowlitz County near Longview. Before the hostilities, members of the Dairymen’s Association confronted milk distributors and contended they needed a better rate for milk. Then they formed a cooperative dairy consisting of most of the local milk producers and creameries.
Some, like Woodland farmer W.F. Martin, refused to join. In response, someone dynamited his milking barn. The Battle Ground Dairy Association also declined the boycott.
As both sides negotiated, the violence escalated. Finally, members of the county dairy association decided to act. First, they blacklisted distributors who disagreed with them. Then they chastised Portland City Commissioner John Mann for lowering milk quality by not enforcing the city’s milk ordinance. Finally, they decided to place three shifts of guards on Clark County roads 24 hours a day to deter distributors’ truck drivers, drawing lines for the milk war.